JP4181418B2 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
JP4181418B2
JP4181418B2 JP2002587794A JP2002587794A JP4181418B2 JP 4181418 B2 JP4181418 B2 JP 4181418B2 JP 2002587794 A JP2002587794 A JP 2002587794A JP 2002587794 A JP2002587794 A JP 2002587794A JP 4181418 B2 JP4181418 B2 JP 4181418B2
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Japan
Prior art keywords
fuel injection
injection valve
fuel
valve
buffer
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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JP2002587794A
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Japanese (ja)
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JP2004519600A (en
Inventor
ライター フェルディナント
フィッシャー ウルリヒ
テメス フランツ
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0685—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/12—Other methods of operation
    • F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • F02M2200/9015—Elastomeric or plastic materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • F02M2200/903—Glass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • F02M2200/9053—Metals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0667—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature acting as a valve or having a short valve body attached thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/166—Selection of particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/90—Electromagnetically actuated fuel injector having ball and seat type valve

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

【０００１】
本発明は、請求項１の上位概念部に記載した燃料噴射弁に関する。
【０００２】
例えばドイツ連邦共和国特許公開第１９６２６５７６号明細書によれば電磁石式に操作可能な燃料噴射弁が公知であり、この燃料噴射弁においては、電磁石式の操作のために可動子が、電気的に励磁される磁石コイルと協働し、可動子のストロークが弁ニードルを介して弁閉鎖体に伝達される。弁閉鎖体は、弁座面と共にシール座を形成する。可動子内には多数の燃料通路が設けられている。可動子の戻し運動は戻しばねによって行われる。
【０００３】
このドイツ連邦共和国特許公開第１９６２６５７６号明細書において公知の燃料噴射弁においては、特にもっぱら燃料噴射弁の周期的な開閉によって引き起こされる圧力脈動が緩衝されずに燃料噴射システムのその他の部分、例えば燃料分配導管に伝達され、それによって共振が生ぜしめられ、この共振によって、燃料噴射弁の運転時に妨害的な雑音発生を引き起こすことになる、という欠点がある。
【０００４】
このような共振によれば、構成部材間の接続が振動によって制限されて解除される可能性もあり、燃料噴射装置又は内燃機関自体の欠陥機能を生ぜしめ、これによって運転確実性に著しく不都合な影響が与えられる。
【０００５】
発明の利点
これに対して、請求項１の特徴部を有する本発明による燃料噴射弁は、燃料噴射弁の切欠内に配置された少なくとも１つの緩衝部材が、弁ニードル運動によって生ぜしめられる圧力脈動によって緩衝されて、燃料分配導管内の共振が抑制されえ、雑音発生が低下せしめられる、という利点を有している。
【０００６】
従属請求項に記載した手段によって、請求項１に記載した燃料噴射弁のその他の有利な実施態様が可能である。
【０００７】
特に、オリフィスの形状に構成された緩衝部材がフィルタエレメントの下流側に配置されているので、燃料によって連行される汚れが濾過され、オリフィスの孔が詰まることはない。
【０００８】
しかも、孔を有するオリフィスが簡単な形状で製造可能であって、燃料噴射弁の組み付け時に切欠内に容易に組み付けることができる。
【０００９】
長い構造を有する燃料噴射弁においては、有利には多数の緩衝部材が使用され、これらの緩衝部材は、例えば種々異なる長さによって緩衝特性が改善される。
【００１０】
多数の緩衝部材を使用した場合、孔はより大きいので、構成部分の大きい長さによって緩衝がより強く行われる。これによって緩衝部材は、フィルタエレメントの流入側にも配置することができる。これによって、より簡単な組み立て若しくは、既に使用されている燃料噴射弁に後付けすることが可能である。
【００１１】
絞りに似た緩衝部材の使用は有利である。何故ならば、緩衝部材内で、弾性的な部材と挿入体とが互いに入れ子式に入り込んでいることによって、共振の抑制による非常に効果的な緩衝が可能である。
【００１２】
図面
本発明の複数の実施例が図面に簡単に示されていて、以下に詳しく説明されている。
【００１３】
図１は、本発明に従って構成された燃料噴射弁の第１実施例の概略的な断面図、
図２は、本発明に従って構成された燃料噴射弁の第２実施例の概略的な断面図、
図３は、本発明に従って構成された燃料噴射弁の第３実施例の図２のＩＩＩ領域の部分的な断面図である。
【００１４】
実施例の説明
図１は、本発明による燃料噴射弁の第１実施例が概略的な断面図で示されている。燃料噴射弁１は、混合気圧縮火花点火式内燃機関の燃料噴射装置のための燃料噴射弁１として構成されている。燃料噴射弁１は、燃料を図示していない内燃機関の燃焼室内に直接噴射するために適している。
【００１５】
燃料噴射弁１はノズル体２より成っており、このノズル体２内に弁ニードル３が配置されている。弁ニードル３は弁閉鎖体４と作用接続しており、この弁閉鎖体４は、弁座体５に配置された弁座面６と協働して１つのシール座を形成している。この燃料噴射弁１は、図示の実施例では内方に開放する、１つの噴射開口７を有する燃料噴射弁１である。
【００１６】
ノズル体２は、シール８によって磁石コイル１０の外極９に対してシールされている。磁石コイル１０は、コイルケーシング１１内にカプセル状に包囲されていて、コイル支持体１２に巻き付けられており、このコイル支持体１２は磁石コイル１０の内極１３に当接している。内極１３と外極９とは、ギャップ２６によって互いに分離されていて、接続構成部２９上に載っている。磁石コイル１０は、電気的なプラグ１７を介して供給可能な電流によって、導線１９を介して励磁される。プラグ１７は、内極１３に射出成形されるプラスチック被覆部１８によって包囲されている。
【００１７】
弁ニードル１３は、弁ニードルガイド１４内でガイドされていて、この弁ニードルガイドは円板状に構成されている。ストローク調節のために、１対形式の調節円板１５が使用される。調節円板１５の他方側には可動子２０が配置されている。この可動子２０は、第１のフランジ２１を介して弁ニードル３に摩擦結合（摩擦による束縛）的に結合されており、この弁ニードル３は、溶接継ぎ目２２によって第１のフランジ２１に接続されている。第１のフランジ２１上には戻しばね２３が支えられており、この戻しばね２３は燃料噴射弁１の図示の構造では、スリーブ２４によってプレロード（予圧）がかけられている。
【００１８】
可動子２０の下流側に第２のフランジ３１が配置されており、この第２のフランジ３１は下側の可動子ストッパとして用いられる。この第２のフランジ３１は、溶接継ぎ目３３を介して弁ニードル３に摩擦結合的に結合されている。可動子２０と第２のフランジ３１との間には、燃料噴射弁１の閉鎖時に可動子の跳ね返りを緩衝するための第２の中間リング３２が配置されている。
【００１９】
弁ニードル１４、可動子２０及び弁座体５内には燃料通路３０ａ〜３０ｃが延びており、これらの燃料通路は、中央の燃料供給部１６を介して供給されフィルタエレメント２５によって濾過される燃料を、噴射開口７に向かってガイドする。燃料噴射弁１は、シール２８によって、図示していない分配導管に対してシールされている。
【００２０】
燃料噴射弁１の非作業状態で、弁ニードル３における第１のフランジ２１が戻しばね２３によって上昇ストローク方向に抗して負荷され、閉鎖体４が弁座６に気密に当接保持されるようになっている。可動子２０は中間リング３２上に載り、この中間リング３２は第２のフランジ３１上に支えられている。磁石コイル１０が励磁されると、この磁石コイル１０は磁界を形成し、この磁界は、可動子２０を戻しばね２３のばね力に抗して上昇ストローク方向で移動させる。この場合、可動子２０は、弁ニードル３に溶接されている第１のフランジ２１を連行し、それによって弁ニードル３を同様に上昇ストローク方向で連行する。弁ニードル３と作用接続している弁閉鎖体４は、弁座面６から持ち上がり、これによって燃料通路３０ａ〜３０ｃを介して噴射開口７までガイドされた燃料が噴射される。
【００２１】
コイル電流が遮断されると、可動子２０は、磁界が十分に解消されてから、第１のフランジ２１上に存在する戻しばね２３のばね力によって内極１３から落下し、それによって弁ニードル３は上昇ストローク方向に抗して移動する。これによって弁閉鎖体４は弁座面６上に載り、燃料噴射弁１は、閉鎖される。可動子２０は、第２のフランジ３１によって形成された可動子ストッパ上に載る。
【００２２】
内極１３の切欠３６内には本発明に従ってオリフィス３４が配置されており、このオリフィス３４は孔３５を備えている。この場合、オリフィス３４は、フィルタエレメント２５の下流側でフィルタエレメント２５と調節スリーブ２４との間に配置されていて、これによって、フィルタエレメント２５及びさらにオリフィス３４を貫流する燃料の汚れが抑制されて、オリフィス３４の孔３５が詰まることはなくなる。
【００２３】
オリフィス３４によって、燃料噴射弁１の運転中に発生する圧力脈動を無くすことができる。圧力脈動は、例えば燃料噴射弁１の周期的な開閉によって生ぜしめられ、その結果特に、詳しく図示していない分配導管内での共振によって雑音が発生する。発生した振動によって個別の構成部分間の差込み結合が解除されることも、圧力脈動の減衰によって抑制される。
【００２４】
オリフィス３４は、別個の構成部分としての第１実施例において製造され、内極１３の切欠内に有利な形式で押し込まれる。しかしながらオリフィス３４を例えば、調節スリーブ２４又はフィルタエレメント２５との組み合わせとして構成することも可能である。
【００２５】
この場合、オリフィス３４の孔３５は、圧力脈動が効果的に減衰され、しかも燃料噴射弁１を流れる燃料流が絞られないように、寸法設計されている。圧力脈動の減衰がより強く行われると、燃料分配導管内の共振及びそれによって生ぜしめられる雑音発生はより小さくなる。
【００２６】
この場合、オリフィス３４を製造するための材料の選択は、特に、燃料の溶剤品質に対するオリフィス３４の形状安定性によって規定される。材料の可鍛性に基づいてオリフィス３４を内極の切欠３６内に押し込みによって簡単に取り付けることができる金属合金及び金属の他に、ばね鋼スリーブ又はエラストマー等のテフロンリング、種々異なるエラストマーの組み合わせ並びにエラストマーと金属とから成る組み合わせも考えられる。エラストマーは繊維補強されるか、又はグラスファイバー、ガラス玉、ロックパウダー、金属粉等の充填剤が充填されていてもよい。
【００２７】
図２は、本発明に従って構成された燃料噴射弁１の第２実施例の概略的な縦断面図が示されている。この燃料噴射弁１は特に、内燃機関の詳しく図示していない吸気管内に燃料を噴射するために適している。図１及び図２において互いに一致する構成部材には、同じ符号が付けられている。
【００２８】
燃料噴射弁１は磁石コイル１０を有しており、この磁石コイル１０はコイル支持体１２に巻き付けられている。コイル支持体１２は、弁ケーシング４０内にカプセル状に包囲されていて、カバー４１によって閉鎖されている。
【００２９】
コイル支持体１２は、弁スリーブ４３によって貫通されており、この弁スリーブ４３は、管状に構成されていて、内部に拡開又は溶接された支持管４４を収容している。この支持管４４は、磁石コイル１０の内極として用いられる。磁石コイル１０の外極として例えば弁ケーシング４０が用いられる。支持管４４の下流側に可動子２０が配置されており、この可動子２０は、弁ニードル３と一体的に構成されている。弁ニードル３内には貫流開口４５が設けられており、この貫流開口４５は燃料噴射弁１を貫流する燃料をシール座にガイドする。
【００３０】
貫流開口４５の領域内には、燃料を濾過するためのリングフィルタ４６が配置されている。弁ニードル３は、図示の実施例では球状の弁閉鎖体と、有利な形式で溶接によって作用接続している。この弁閉鎖体は弁座体５と協働して１つのシール座を形成している。シール座の下流側で、噴射孔付き円板４７には少なくとも１つの噴射開口７が形成されており、この噴射開口７から燃料が、詳しく図示していない吸気管に噴射される。
【００３１】
可動子２０は、燃料噴射弁１の非作業状態で戻しばね２３によって負荷されて、燃料噴射弁１が支持管４４若しくは可動子２０の切欠４８内に配置されていて、調節スリーブ２４によってプレロード（予圧）をかけられている。調節スリーブ２４の流入側には鉢状のフィルタエレメント２５が弁スリーブ４３内に有利には押し込まれている。中央の燃料供給部１６を通ってガイドされる燃料は、切欠４８及び貫流開口４５を通って燃料噴射弁１を貫流してシール座及び噴射開口７に向かって流れる。
【００３２】
弁スリーブ４３の流入側の端部４９内には、金属製の管状の中空体５０が挿入されていて、例えばフィルタエレメント２５の領域内で弁スリーブ４３に溶接されている。さらに詳しく図示していない燃料分配導管に組み付けるために、燃料噴射弁１は、金属製の中空体５０の流入側の端部５１でシール２８を備えている。別のシール５２は、燃料噴射弁１と吸気管との間の詳しく図示していない接続部をシールする。磁石コイル１０は、導線１９を介して、電気的なプラグ１７を介して供給可能な電流によって励磁される。プラグ１７は、プラスチック被覆部１８によって包囲されており、このプラスチック被覆部１８は、弁スリーブ４３若しくは中空対５０に射出成形によって形成することができる。
【００３３】
磁石コイル１０に、詳しく図示していない導線を介して電流が供給されると、磁界が形成され、この磁界は、十分な強さを有している場合には、可動子２０を戻しばね２３のばね力に抗して、燃料の流れ方向とは逆方向に磁石コイル１０内に引き込む。これによって、可動子２０と支持管４４との間に形成された作業ギャップ２７が閉鎖される。可動子２０の運動によって、可動子２０と一体的に構成された弁ニードル３も上昇ストローク方向に連行されるので、弁閉鎖体４は弁座体５から持ち上がり、燃料を噴射開口７にガイドする。
【００３４】
磁石コイルを励磁する電流が遮断されると直ちに、燃料噴射弁１は閉鎖され、戻しばね２３が可動子２０を支持管４４から押し離して、それによって弁ニードル３が流出方向で移動して弁閉鎖体４が弁座体５に載るまで磁界は消滅する。
【００３５】
金属製の中空体５０内には本発明に従って緩衝部材３７が配置されている。図示の実施例では、緩衝特性を高めるために２つの緩衝部材３７ａ、３７ｂが設けられている。これらの緩衝部材３７ａ，３７ｂは、主に燃料噴射弁１の開閉によって及びそれに続く燃料分配システムの種々異なる部分内の共振によって生ぜしめられる圧力脈動を緩衝するという点で、図１に示した第１実施例におけるオリフィス３４と同じ機能を有している。
【００３６】
燃料噴射弁１の大きい構造長さ及びそれに基づく所用空間によって制限された、緩衝部材３７ａ，３７ｂの大きい軸方向の構造長さによって、緩衝部材３７ａ及び３７ｂの切欠３８は、図１に示した孔３５よりも大きく、しかも緩衝作用を弱めることはない。
【００３７】
燃料流内に渦流が形成されるのを避けるために、緩衝部材３７ａ，３７ｂの形状は種々異なっている。例えば切欠３８は、緩衝部材３７ａ及び３７ｂの軸方向長さ全体に亘って可変な直径を有していてよいが、またこの切欠３８は、流入領域内に形成されているか、又は内壁に流れを改善するための構造を有していてもよい。同様に、緩衝部材３７ａ，３７ｂの軸方向の間隔Ｘは可変に構成することができる。
【００３８】
図３には、本発明による緩衝部材３７のための第３実施例の一部の断面図が示されており、この緩衝部材３７は例えば、図２に関する説明に詳しく記載されている燃料噴射弁の金属製の中空体５０内に挿入されている。
【００３９】
この場合、緩衝部材３７はその切欠３８内で少なくとも１つ、有利には多数の弾性的な部材５６を有しており、これらの部材５６は、緩衝部材３７の流入側の端部５５に接続されている。これらの部材５６は、燃料の流れ方向で切欠３８内に、鉢状の挿入体５７の内部まで延びており、この挿入体５７は、緩衝部材３７の流入側の端部５８で切欠３８内に配置されていて、少なくとも１箇所で緩衝部材３３７に接続されている。
【００４０】
鉢状の挿入体５７は、緩衝部材３７の流入側の端部５５に向かって開放していて、挿入体５７の壁部６０内で少なくとも１つ有利には多数の貫流開口５９を有している。
【００４１】
燃料噴射弁１を貫流する燃料は、流入側の端部５５を通って緩衝部材３７内に流入し、弾性的な部材５６によって形成された、切欠３８の狭窄部を通ってやや絞られる。この場合、弾性的な部材５６は、燃料を半径方向で外方に押しやる。燃料はさらに、流入側で開放している鉢状の挿入体５７内に流れる。次いで燃料は、挿入体５７の壁部６０に形成された貫流開口５９を介して、まず挿入体５７を流過し、次いで緩衝部材３７を流過する。この場合、緩衝部材３７を通る燃料の可能な経路は矢印で示されている。
【００４２】
図３に示された緩衝部材３７によって得られる緩衝は非常に効果的である。何故ならば、挿入体５７が緩衝部材３７に互いに入れ子式にはめ込まれ、また弾性的な部材５６が挿入体５７内に互いに入れ子式にはめ込まれていることによって、燃料供給部１６の方向で振動が伝達されることはなく、それによって雑音発生は特に強く減少されるからである。
【００４３】
本発明は、図示の実施例だけに限定されるものではなく、例えば外部圧縮自己点火式内燃機関用の燃料噴射弁１のためにも使用可能である。
【図面の簡単な説明】
【図１】 本発明に従って構成された燃料噴射弁の第１実施例の概略的な断面図である。
【図２】 図２は、本発明に従って構成された燃料噴射弁の第２実施例の概略的な断面図である。
【図３】 図３は、本発明に従って構成された燃料噴射弁の第３実施例の図２のＩＩＩ領域の部分的な断面図である。[0001]
The present invention relates to a fuel injection valve described in the superordinate conceptual part of claim 1.
[0002]
For example, according to DE 19626576, an electromagnetically operable fuel injection valve is known, in which a mover is electrically excited for electromagnetic operation. In cooperation with the magnet coil, the stroke of the mover is transmitted to the valve closing body via the valve needle. The valve closure forms a seal seat with the valve seat surface. A number of fuel passages are provided in the mover. The return movement of the mover is performed by a return spring.
[0003]
In the fuel injection valve known from DE 196 26 576, the pressure pulsation caused by the periodic opening and closing of the fuel injection valve, in particular, is not buffered and other parts of the fuel injection system, for example the fuel This has the disadvantage that it is transmitted to the distribution conduit and thereby causes a resonance which causes disturbing noise generation when the fuel injector is in operation.
[0004]
According to such resonance, there is a possibility that the connection between the constituent members is restricted due to the vibration and is released, which causes a defective function of the fuel injection device or the internal combustion engine itself, which is extremely inconvenient for operation reliability. Affected.
[0005]
Advantages of the Invention In contrast, the fuel injection valve according to the invention with the features of claim 1 is characterized in that the pressure pulsation in which at least one buffer member arranged in the notch of the fuel injection valve is caused by the valve needle movement. This has the advantage that resonance in the fuel distribution conduit can be suppressed and noise generation can be reduced.
[0006]
By means of the dependent claims, other advantageous embodiments of the fuel injection valve according to claim 1 are possible.
[0007]
In particular, since the shock absorbing member configured in the shape of the orifice is disposed on the downstream side of the filter element, dirt entrained by the fuel is filtered and the orifice hole is not clogged.
[0008]
In addition, the orifice having a hole can be manufactured in a simple shape, and can be easily assembled in the notch when the fuel injection valve is assembled.
[0009]
In a fuel injection valve having a long structure, a large number of buffer members are preferably used, and these buffer members have an improved buffer characteristic, for example by different lengths.
[0010]
When a large number of cushioning members are used, the holes are larger, so that the greater the length of the component, the stronger the cushioning. Thereby, the buffer member can also be arranged on the inflow side of the filter element. This allows for easier assembly or retrofit to already used fuel injectors.
[0011]
The use of a cushioning member similar to the diaphragm is advantageous. This is because the elastic member and the insert are nested in each other in the buffer member, so that very effective buffering by suppressing resonance is possible.
[0012]
BRIEF DESCRIPTION OF THE DRAWINGS A number of embodiments of the invention are shown briefly in the drawings and are described in detail below.
[0013]
1 is a schematic cross-sectional view of a first embodiment of a fuel injection valve constructed in accordance with the present invention;
FIG. 2 is a schematic cross-sectional view of a second embodiment of a fuel injection valve constructed in accordance with the present invention;
FIG. 3 is a partial cross-sectional view of region III of FIG. 2 of a third embodiment of a fuel injector constructed in accordance with the present invention.
[0014]
DESCRIPTION OF THE EMBODIMENTS FIG. 1 is a schematic sectional view showing a first embodiment of a fuel injection valve according to the present invention. The fuel injection valve 1 is configured as a fuel injection valve 1 for a fuel injection device of an air-fuel mixture compression spark ignition type internal combustion engine. The fuel injection valve 1 is suitable for injecting fuel directly into a combustion chamber of an internal combustion engine (not shown).
[0015]
The fuel injection valve 1 includes a nozzle body 2 in which a valve needle 3 is disposed. The valve needle 3 is operatively connected to a valve closing body 4, which cooperates with a valve seat surface 6 arranged on the valve seat body 5 to form one seal seat. The fuel injection valve 1 is a fuel injection valve 1 having one injection opening 7 that opens inward in the illustrated embodiment.
[0016]
The nozzle body 2 is sealed against the outer pole 9 of the magnet coil 10 by a seal 8. The magnet coil 10 is encapsulated in a coil casing 11 and is wound around a coil support 12. The coil support 12 is in contact with the inner pole 13 of the magnet coil 10. The inner pole 13 and the outer pole 9 are separated from each other by the gap 26 and are placed on the connection component 29. The magnet coil 10 is excited via the conducting wire 19 by a current that can be supplied via the electrical plug 17. The plug 17 is surrounded by a plastic covering portion 18 that is injection-molded on the inner pole 13.
[0017]
The valve needle 13 is guided in a valve needle guide 14, and the valve needle guide is formed in a disc shape. A pair of adjustment disks 15 are used for stroke adjustment. A mover 20 is disposed on the other side of the adjustment disc 15. The movable element 20 is connected to the valve needle 3 through a first flange 21 in a frictional connection (constrained by friction). The valve needle 3 is connected to the first flange 21 by a weld seam 22. ing. A return spring 23 is supported on the first flange 21, and the return spring 23 is preloaded (preloaded) by a sleeve 24 in the illustrated structure of the fuel injection valve 1.
[0018]
A second flange 31 is disposed on the downstream side of the mover 20, and the second flange 31 is used as a lower mover stopper. The second flange 31 is frictionally coupled to the valve needle 3 via a weld seam 33. A second intermediate ring 32 is disposed between the mover 20 and the second flange 31 to buffer the rebound of the mover when the fuel injection valve 1 is closed.
[0019]
Fuel passages 30 a to 30 c extend in the valve needle 14, the mover 20, and the valve seat body 5, and these fuel passages are supplied via a central fuel supply unit 16 and are filtered by the filter element 25. Is guided toward the injection opening 7. The fuel injection valve 1 is sealed against a distribution conduit (not shown) by a seal 28.
[0020]
When the fuel injection valve 1 is not in operation, the first flange 21 of the valve needle 3 is loaded against the upward stroke direction by the return spring 23 so that the closing body 4 is held in airtight contact with the valve seat 6. It has become. The mover 20 is placed on an intermediate ring 32, and the intermediate ring 32 is supported on the second flange 31. When the magnet coil 10 is excited, the magnet coil 10 forms a magnetic field, and the magnetic field moves the mover 20 in the upward stroke direction against the spring force of the return spring 23. In this case, the mover 20 entrains the first flange 21 welded to the valve needle 3, thereby entraining the valve needle 3 in the upward stroke direction as well. The valve closing body 4 operatively connected to the valve needle 3 is lifted from the valve seat surface 6, whereby the fuel guided to the injection opening 7 is injected through the fuel passages 30 a to 30 c.
[0021]
When the coil current is interrupted, the mover 20 is dropped from the inner pole 13 by the spring force of the return spring 23 existing on the first flange 21 after the magnetic field is sufficiently eliminated, thereby the valve needle 3. Moves against the upward stroke direction. As a result, the valve closing body 4 rests on the valve seat surface 6 and the fuel injection valve 1 is closed. The mover 20 is placed on a mover stopper formed by the second flange 31.
[0022]
An orifice 34 is disposed in the notch 36 of the inner pole 13 according to the present invention, and the orifice 34 has a hole 35. In this case, the orifice 34 is disposed between the filter element 25 and the adjustment sleeve 24 on the downstream side of the filter element 25, thereby suppressing contamination of fuel flowing through the filter element 25 and the orifice 34. The hole 35 of the orifice 34 is not clogged.
[0023]
The orifice 34 can eliminate pressure pulsation that occurs during operation of the fuel injection valve 1. The pressure pulsation is caused, for example, by the periodic opening and closing of the fuel injection valve 1, and as a result, noise is generated due to resonance in a distribution conduit not shown in detail. Release of the insertion coupling between the individual components due to the generated vibration is also suppressed by the attenuation of the pressure pulsation.
[0024]
The orifice 34 is manufactured in the first embodiment as a separate component and is pushed into the notch of the inner pole 13 in an advantageous manner. However, it is also possible to configure the orifice 34 as a combination with, for example, the adjusting sleeve 24 or the filter element 25.
[0025]
In this case, the hole 35 of the orifice 34 is dimensioned so that the pressure pulsation is effectively attenuated and the fuel flow through the fuel injection valve 1 is not throttled. The stronger the pressure pulsation is attenuated, the less resonance in the fuel distribution conduit and the noise generation caused thereby.
[0026]
In this case, the choice of material for producing the orifice 34 is dictated in particular by the shape stability of the orifice 34 with respect to the solvent quality of the fuel. In addition to metal alloys and metals that can be easily mounted by pushing the orifice 34 into the notch 36 of the inner pole based on the malleability of the material, teflon rings such as spring steel sleeves or elastomers, combinations of different elastomers, and A combination of elastomer and metal is also conceivable. The elastomer may be fiber reinforced or may be filled with a filler such as glass fiber, glass ball, lock powder, metal powder or the like.
[0027]
FIG. 2 shows a schematic longitudinal section of a second embodiment of a fuel injection valve 1 constructed according to the invention. The fuel injection valve 1 is particularly suitable for injecting fuel into an intake pipe (not shown in detail) of an internal combustion engine. In FIG.1 and FIG.2, the same code | symbol is attached | subjected to the component which mutually corresponds.
[0028]
The fuel injection valve 1 has a magnet coil 10, and this magnet coil 10 is wound around a coil support 12. The coil support 12 is encapsulated in a valve casing 40 and is closed by a cover 41.
[0029]
The coil support 12 is penetrated by a valve sleeve 43. The valve sleeve 43 is formed in a tubular shape and accommodates a support tube 44 that is expanded or welded therein. The support tube 44 is used as an inner pole of the magnet coil 10. For example, a valve casing 40 is used as the outer pole of the magnet coil 10. The mover 20 is disposed on the downstream side of the support tube 44, and the mover 20 is configured integrally with the valve needle 3. A through-flow opening 45 is provided in the valve needle 3, and the through-flow opening 45 guides the fuel flowing through the fuel injection valve 1 to the seal seat.
[0030]
A ring filter 46 for filtering fuel is disposed in the region of the through-flow opening 45. The valve needle 3 is operatively connected by welding in a preferred manner with a spherical valve closure in the embodiment shown. The valve closing body cooperates with the valve seat body 5 to form one seal seat. At least one injection opening 7 is formed in the disk 47 with injection holes on the downstream side of the seal seat, and fuel is injected from the injection openings 7 into an intake pipe (not shown in detail).
[0031]
The mover 20 is loaded by the return spring 23 in a non-working state of the fuel injection valve 1, and the fuel injection valve 1 is disposed in the support tube 44 or the notch 48 of the mover 20, and is preloaded by the adjustment sleeve 24 ( Preload) is applied. A bowl-shaped filter element 25 is advantageously pushed into the valve sleeve 43 on the inflow side of the adjustment sleeve 24. The fuel guided through the central fuel supply 16 flows through the fuel injection valve 1 through the notch 48 and the through-flow opening 45 and flows toward the seal seat and the injection opening 7.
[0032]
A metal tubular hollow body 50 is inserted in the end portion 49 on the inflow side of the valve sleeve 43 and is welded to the valve sleeve 43 in the region of the filter element 25, for example. The fuel injection valve 1 is provided with a seal 28 at the end 51 on the inflow side of the metal hollow body 50 for assembly into a fuel distribution conduit not shown in more detail. Another seal 52 seals a connection (not shown in detail) between the fuel injection valve 1 and the intake pipe. The magnet coil 10 is excited by a current that can be supplied via an electrical plug 17 via a conductor 19. The plug 17 is surrounded by a plastic covering portion 18, and the plastic covering portion 18 can be formed on the valve sleeve 43 or the hollow pair 50 by injection molding.
[0033]
When a current is supplied to the magnet coil 10 through a conductor not shown in detail, a magnetic field is formed. If this magnetic field has a sufficient strength, the mover 20 is returned to the return spring 23. The magnet coil 10 is drawn in the direction opposite to the fuel flow direction against the spring force. As a result, the working gap 27 formed between the mover 20 and the support tube 44 is closed. As the mover 20 moves, the valve needle 3 integrally formed with the mover 20 is also entrained in the upward stroke direction, so that the valve closing body 4 is lifted from the valve seat body 5 and guides fuel to the injection opening 7. .
[0034]
As soon as the current that excites the magnet coil is interrupted, the fuel injection valve 1 is closed, and the return spring 23 pushes the mover 20 away from the support tube 44, whereby the valve needle 3 moves in the outflow direction. The magnetic field disappears until the closing body 4 rests on the valve seat body 5.
[0035]
A shock absorbing member 37 is disposed in the metal hollow body 50 according to the present invention. In the illustrated embodiment, two buffer members 37a and 37b are provided to improve the buffer characteristics. These buffer members 37a, 37b buffer the pressure pulsations caused by the opening and closing of the fuel injection valve 1 and the subsequent resonance in different parts of the fuel distribution system, as shown in FIG. It has the same function as the orifice 34 in one embodiment.
[0036]
Due to the large structural length of the fuel injection valve 1 and the large axial structural length of the buffer members 37a, 37b limited by the required space based on it, the notches 38 of the buffer members 37a and 37b have the holes shown in FIG. It is larger than 35 and does not weaken the buffering action.
[0037]
In order to avoid the formation of a vortex in the fuel flow, the shapes of the buffer members 37a and 37b are different. For example, the notch 38 may have a variable diameter over the entire axial length of the buffer members 37a and 37b, but the notch 38 is formed in the inflow region or allows flow to the inner wall. You may have the structure for improving. Similarly, the axial interval X of the buffer members 37a and 37b can be configured to be variable.
[0038]
FIG. 3 shows a cross-sectional view of a part of a third embodiment for a shock absorber 37 according to the invention, for example a fuel injection valve which is described in detail in the description with reference to FIG. The metal hollow body 50 is inserted.
[0039]
In this case, the buffer member 37 has at least one, preferably a number of elastic members 56 in its notch 38, which members 56 are connected to the inflow end 55 of the buffer member 37. Has been. These members 56 extend in the notch 38 to the inside of the bowl-shaped insert 57 in the fuel flow direction. The insert 57 is inserted into the notch 38 at the end 58 on the inflow side of the buffer member 37. It arrange | positions and is connected to the buffer member 337 at least at one place.
[0040]
The bowl-shaped insert 57 opens towards the end 55 on the inflow side of the cushioning member 37 and has at least one, preferably a number of through-openings 59 in the wall 60 of the insert 57. Yes.
[0041]
The fuel flowing through the fuel injection valve 1 flows into the buffer member 37 through the end portion 55 on the inflow side, and is slightly throttled through the narrowed portion of the notch 38 formed by the elastic member 56. In this case, the elastic member 56 pushes the fuel outward in the radial direction. The fuel further flows into a bowl-shaped insert 57 that is open on the inflow side. Next, the fuel first flows through the insert 57 through the through-flow opening 59 formed in the wall portion 60 of the insert 57, and then flows through the buffer member 37. In this case, possible paths of fuel through the buffer member 37 are indicated by arrows.
[0042]
The buffer obtained by the buffer member 37 shown in FIG. 3 is very effective. This is because the insert 57 is telescoped into the buffer member 37 and the elastic member 56 is telescoped into the insert 57 to vibrate in the direction of the fuel supply 16. Is not transmitted, and thereby noise generation is particularly strongly reduced.
[0043]
The invention is not limited to the embodiment shown, but can also be used, for example, for a fuel injection valve 1 for an external compression self-ignition internal combustion engine.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a first embodiment of a fuel injection valve constructed in accordance with the present invention.
FIG. 2 is a schematic cross-sectional view of a second embodiment of a fuel injection valve constructed in accordance with the present invention.
FIG. 3 is a partial cross-sectional view of region III of FIG. 2 of a third embodiment of a fuel injection valve constructed in accordance with the present invention.

Claims (12)

燃料噴射弁（１）であって、磁石コイル（１０）を有しており、該磁石コイル（１０）は、戻しばね（２３）によって負荷された可動子（２０）と協働し、この可動子（２０）は弁ニードル（３）と共に軸方向に可動な弁部分を形成しており、前記弁ニードル（３）に弁閉鎖体（４）が設けられていて、この弁閉鎖体（４）は弁座体（５）と共に１つのシール座を形成している形式のものにおいて、
燃料が貫流する燃料噴射弁（１）の内極（１３）の切欠（３６）内に少なくとも１つの緩衝部材（３７）が配置されており、該緩衝部材（３７）が、流入側の端部（５５）で少なくとも１つの弾性的な部材（５６）を有しており、該弾性的な部材（５６）が、燃料の流れ方向で緩衝部材（３７）の切欠（３８）内に延びていることを特徴とする燃料噴射弁。A fuel injection valve (1) having a magnet coil (10), which cooperates with a mover (20) loaded by a return spring (23), The child (20) forms a valve portion movable in the axial direction together with the valve needle (3). The valve needle (3) is provided with a valve closing body (4), and the valve closing body (4). In the form of forming a seal seat with the valve seat body (5),
At least one buffer member (37) is disposed in the notch (36) of the inner pole (13) of the fuel injection valve (1) through which the fuel flows , and the buffer member (37) has an end portion on the inflow side. (55) having at least one elastic member (56) which extends into the notch (38) of the buffer member (37) in the direction of fuel flow . The fuel injection valve characterized by the above-mentioned. 前記少なくとも１つの緩衝部材（３７）が、孔（３５）を有するオリフィス（３４）の形状に構成されている、請求項１記載の燃料噴射弁。  The fuel injection valve according to claim 1, wherein the at least one buffer member (37) is configured in the form of an orifice (34) having a hole (35). 少なくとも１つの緩衝部材（３７）が、戻しばね（２３）にプレロードをかけるために、フィルタエレメント（２５）と調節スリーブ（２４）との間に配置されている、請求項１又は２記載の燃料噴射弁。  The fuel according to claim 1 or 2, wherein at least one buffer member (37) is arranged between the filter element (25) and the adjusting sleeve (24) for preloading the return spring (23). Injection valve. オリフィス（３４）の孔（３５）は、燃料噴射弁（１）を貫流する燃料流が絞られないように、寸法設計されている、請求項２記載の燃料噴射弁。  The fuel injection valve according to claim 2, wherein the hole (35) of the orifice (34) is dimensioned so that the fuel flow through the fuel injection valve (1) is not throttled. 少なくとも１つの緩衝部材（３７）が、燃料噴射弁（１）の流入側を延長する金属製の中空体（５０）内に配置されている、請求項１又は２記載の燃料噴射弁。  The fuel injection valve according to claim 1 or 2, wherein at least one buffer member (37) is arranged in a metal hollow body (50) extending the inflow side of the fuel injection valve (1). ２つの緩衝部材（３７ａ，３７ｂ）が設けられている、請求項５記載燃料噴射弁。  The fuel injection valve according to claim 5, wherein two buffer members (37a, 37b) are provided. 緩衝部材（３７ａ，３７ｂ）がフィルタエレメント（２５）の流入側に配置されている、請求項６記載の燃料噴射弁。  The fuel injection valve according to claim 6, wherein the buffer members (37a, 37b) are arranged on the inflow side of the filter element (25). 緩衝部材（３７ａ，３７ｂ）の軸方向長さが異なっている、請求項６又は７記載の燃料噴射弁。  The fuel injection valve according to claim 6 or 7, wherein the axial lengths of the buffer members (37a, 37b) are different. 緩衝部材（３７ａ，３７ｂ）間の軸方向の間隔（ｘ）が可変である、請求項６から８までのいずれか１項記載の燃料噴射弁。  The fuel injection valve according to any one of claims 6 to 8, wherein an axial interval (x) between the buffer members (37a, 37b) is variable. 少なくとも１つの弾性的な部材（５６）が鉢状の挿入体（５７）内に延びていて、該挿入体（５７）は、緩衝部材（３７）の下流側の端部（５８）に配置されており、前記挿入体（５７）が緩衝部材（３７）の流入側の端部（５５）に向かって開放している、請求項１記載の燃料噴射弁。At least one elastic member (56) extends into the bowl-shaped insert (57), and the insert (57) is disposed at the downstream end (58) of the cushioning member (37). and it has the insert (57) is buffer member end of the inflow side of (37) is open towards the (55), according to claim 1 fuel injection valve according. 鉢状の挿入体（５７）が、該挿入体（５７）の壁部（６０）に少なくとも１つの貫流開口（５９）を有している、請求項１０記載の燃料噴射弁。11. The fuel injection valve according to claim 10 , wherein the bowl-shaped insert (57) has at least one flow-through opening (59) in the wall (60) of the insert (57). 鉢状の挿入体（５７）が緩衝部材（３７）に接続されている、請求項１０又は１１記載の燃料噴射弁。The fuel injection valve according to claim 10 or 11 , wherein the bowl-shaped insert (57) is connected to the buffer member (37).
JP2002587794A 2001-05-09 2002-04-23 Fuel injection valve Expired - Fee Related JP4181418B2 (en)

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DE50206024D1 (en) 2006-05-04
DE10122353B4 (en) 2004-04-22
US7059548B2 (en) 2006-06-13
US20030155448A1 (en) 2003-08-21
EP1387942A1 (en) 2004-02-11
EP1387942B1 (en) 2006-03-08
CN1462338A (en) 2003-12-17
WO2002090757A1 (en) 2002-11-14
DE10122353A1 (en) 2002-11-28

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